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2541503d | 1 | /* Data structures and functions for streaming trees. |
2 | ||
fbd26352 | 3 | Copyright (C) 2011-2019 Free Software Foundation, Inc. |
2541503d | 4 | Contributed by Diego Novillo <dnovillo@google.com> |
5 | ||
6 | This file is part of GCC. | |
7 | ||
8 | GCC is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 3, or (at your option) any later | |
11 | version. | |
12 | ||
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GCC; see the file COPYING3. If not see | |
20 | <http://www.gnu.org/licenses/>. */ | |
21 | ||
22 | #ifndef GCC_TREE_STREAMER_H | |
23 | #define GCC_TREE_STREAMER_H | |
24 | ||
515cf651 | 25 | #include "streamer-hooks.h" |
2e971afd | 26 | #include "data-streamer.h" |
2541503d | 27 | |
28 | /* Cache of pickled nodes. Used to avoid writing the same node more | |
29 | than once. The first time a tree node is streamed out, it is | |
30 | entered in this cache. Subsequent references to the same node are | |
31 | resolved by looking it up in this cache. | |
32 | ||
33 | This is used in two ways: | |
34 | ||
35 | - On the writing side, the first time T is added to STREAMER_CACHE, | |
36 | a new reference index is created for T and T is emitted on the | |
37 | stream. If T needs to be emitted again to the stream, instead of | |
38 | pickling it again, the reference index is emitted. | |
39 | ||
40 | - On the reading side, the first time T is read from the stream, it | |
41 | is reconstructed in memory and a new reference index created for | |
42 | T. The reconstructed T is inserted in some array so that when | |
43 | the reference index for T is found in the input stream, it can be | |
44 | used to look up into the array to get the reconstructed T. */ | |
8ceff600 | 45 | |
7f385784 | 46 | struct streamer_tree_cache_d |
2541503d | 47 | { |
48 | /* The mapping between tree nodes and slots into the nodes array. */ | |
d62dd039 | 49 | hash_map<tree, unsigned> *node_map; |
2541503d | 50 | |
51 | /* The nodes pickled so far. */ | |
f1f41a6c | 52 | vec<tree> nodes; |
8ceff600 | 53 | /* The node hashes (if available). */ |
54 | vec<hashval_t> hashes; | |
b1e946ea | 55 | |
56 | /* Next index to assign. */ | |
57 | unsigned next_idx; | |
2541503d | 58 | }; |
59 | ||
60 | /* In tree-streamer-in.c. */ | |
7f385784 | 61 | tree streamer_read_string_cst (struct data_in *, struct lto_input_block *); |
62 | tree streamer_read_chain (struct lto_input_block *, struct data_in *); | |
63 | tree streamer_alloc_tree (struct lto_input_block *, struct data_in *, | |
64 | enum LTO_tags); | |
65 | void streamer_read_tree_body (struct lto_input_block *, struct data_in *, tree); | |
66 | tree streamer_get_pickled_tree (struct lto_input_block *, struct data_in *); | |
205b5601 | 67 | void streamer_read_tree_bitfields (struct lto_input_block *, |
68 | struct data_in *, tree); | |
2541503d | 69 | |
70 | /* In tree-streamer-out.c. */ | |
65d1b157 | 71 | void streamer_write_string_cst (struct output_block *, |
72 | struct lto_output_stream *, tree); | |
7f385784 | 73 | void streamer_write_chain (struct output_block *, tree, bool); |
74 | void streamer_write_tree_header (struct output_block *, tree); | |
c76dc468 | 75 | void streamer_write_tree_bitfields (struct output_block *, tree); |
7f385784 | 76 | void streamer_write_tree_body (struct output_block *, tree, bool); |
77 | void streamer_write_integer_cst (struct output_block *, tree, bool); | |
2541503d | 78 | |
79 | /* In tree-streamer.c. */ | |
2e971afd | 80 | extern unsigned char streamer_mode_table[1 << 8]; |
7f385784 | 81 | void streamer_check_handled_ts_structures (void); |
82 | bool streamer_tree_cache_insert (struct streamer_tree_cache_d *, tree, | |
8ceff600 | 83 | hashval_t, unsigned *); |
84 | void streamer_tree_cache_replace_tree (struct streamer_tree_cache_d *, tree, | |
85 | unsigned); | |
86 | void streamer_tree_cache_append (struct streamer_tree_cache_d *, tree, | |
87 | hashval_t); | |
7f385784 | 88 | bool streamer_tree_cache_lookup (struct streamer_tree_cache_d *, tree, |
89 | unsigned *); | |
b1e946ea | 90 | struct streamer_tree_cache_d *streamer_tree_cache_create (bool, bool, bool); |
7f385784 | 91 | void streamer_tree_cache_delete (struct streamer_tree_cache_d *); |
2541503d | 92 | |
23244f0b | 93 | /* Return the tree node at slot IX in CACHE. */ |
94 | ||
95 | static inline tree | |
8ceff600 | 96 | streamer_tree_cache_get_tree (struct streamer_tree_cache_d *cache, unsigned ix) |
23244f0b | 97 | { |
f1f41a6c | 98 | return cache->nodes[ix]; |
23244f0b | 99 | } |
100 | ||
8ceff600 | 101 | /* Return the tree hash value at slot IX in CACHE. */ |
102 | ||
103 | static inline hashval_t | |
104 | streamer_tree_cache_get_hash (struct streamer_tree_cache_d *cache, unsigned ix) | |
105 | { | |
106 | return cache->hashes[ix]; | |
107 | } | |
108 | ||
2e971afd | 109 | static inline void |
110 | bp_pack_machine_mode (struct bitpack_d *bp, machine_mode mode) | |
111 | { | |
112 | streamer_mode_table[mode] = 1; | |
113 | bp_pack_enum (bp, machine_mode, 1 << 8, mode); | |
114 | } | |
115 | ||
116 | static inline machine_mode | |
117 | bp_unpack_machine_mode (struct bitpack_d *bp) | |
118 | { | |
119 | return (machine_mode) | |
120 | ((struct lto_input_block *) | |
121 | bp->stream)->mode_table[bp_unpack_enum (bp, machine_mode, 1 << 8)]; | |
122 | } | |
23244f0b | 123 | |
2541503d | 124 | #endif /* GCC_TREE_STREAMER_H */ |